EP4235130A2 - Sealed pressure-measuring member - Google Patents

Sealed pressure-measuring member Download PDF

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Publication number
EP4235130A2
EP4235130A2 EP23171439.5A EP23171439A EP4235130A2 EP 4235130 A2 EP4235130 A2 EP 4235130A2 EP 23171439 A EP23171439 A EP 23171439A EP 4235130 A2 EP4235130 A2 EP 4235130A2
Authority
EP
European Patent Office
Prior art keywords
housing
casing
pressure
parts
test body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23171439.5A
Other languages
German (de)
French (fr)
Other versions
EP4235130A3 (en
Inventor
Jonathan Champredonde
Richard Leman
Mark Leman
Peter Smith
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Compagnie Generale des Etablissements Michelin SCA
Original Assignee
Compagnie Generale des Etablissements Michelin SCA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Compagnie Generale des Etablissements Michelin SCA filed Critical Compagnie Generale des Etablissements Michelin SCA
Publication of EP4235130A2 publication Critical patent/EP4235130A2/en
Publication of EP4235130A3 publication Critical patent/EP4235130A3/en
Pending legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/14—Housings
    • G01L19/142—Multiple part housings
    • G01L19/144—Multiple part housings with dismountable parts, e.g. for maintenance purposes or for ensuring sterile conditions
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L17/00—Devices or apparatus for measuring tyre pressure or the pressure in other inflated bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/02—Signalling devices actuated by tyre pressure
    • B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
    • B60C23/0491—Constructional details of means for attaching the control device
    • B60C23/0493—Constructional details of means for attaching the control device for attachment on the tyre
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
    • G01L19/0627—Protection against aggressive medium in general
    • G01L19/0645—Protection against aggressive medium in general using isolation membranes, specially adapted for protection
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/08—Means for indicating or recording, e.g. for remote indication
    • G01L19/086—Means for indicating or recording, e.g. for remote indication for remote indication
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/14—Housings
    • G01L19/142—Multiple part housings
    • G01L19/143—Two part housings

Definitions

  • the present invention relates to the field of pressure sensors.
  • the invention applies, without being restricted thereto, to measuring the pressure of a tire, in particular of the civil engineering type.
  • the organ is of the passive type and comprises a protective casing.
  • the member also comprises a test body and the housing includes a wall bearing a pressure measurement surface functionally linked to the test body. Indeed, this wall comprises a depression arranged so that the wall is positioned in contact with the test body. Under the effect of the external pressure exerted on the wall, the depression mechanically transmits the pressure to the test body which can then detect the pressure external to the organ.
  • each measuring member must be calibrated at the end of its manufacture, which is therefore tedious and expensive. It also requires storage of the calibration data in a processing unit of the organ. This increases the complexity and cost of the system. Also, calibration data is a source of measurement error.
  • the component is not completely sealed for its entire life, it is not protected from chemical attacks, in particular those from products used for maintenance. rims and tires. This prolonged exposure to chemical attacks causes an alteration of the test body and therefore of the pressure measurement.
  • the invention aims to provide a reliable pressure measuring device.
  • the pressure-measuring member When it is positioned in the tire, the pressure-measuring member is subjected to attack by solid and liquid debris present in the tire. In particular, debris can come into contact with the pressure measurement surface and disturb the reliability of the measurement. It is therefore necessary to protect the pressure measuring member while allowing reliable measurement of the pressure of the tire.
  • the subject of the invention is a casing for protecting a tire pressure measurement orange according to claim 1.
  • the protective casing makes it possible to protect the member, in particular the pressure measurement surface, from shocks and certain solid debris, for example pebbles.
  • the housing thus allows the air pressurized in the tire to penetrate into the protective housing so that the pressure can be detected by the pressure measurement surface.
  • the passage being delimited by the first and second parts, it is not necessary to provide a passage for the air specific to each of the parts.
  • the passage is formed during assembly of the housing in its position for holding the member.
  • the passage space is defined at least in part by a skirt covering the side wall, the passage space makes it possible to maintain an air passage between the interior and the exterior of the protective enclosure, even if the passage space is clogged with debris in a few isolated places. Indeed, it is very unlikely that the entire passage space will be blocked so that there is always an air passage between the inside and the outside of the box, thus making it possible to measure the pressure of the tire correctly.
  • the box includes spacer means between the first and second parts.
  • the interlocking means make it possible, in the holding position, to define the air passage space.
  • the passage space has, in section, a general profile in the shape of an elbow between the inside and the outside of the casing.
  • the cover skirt has a tapered profile.
  • the tapering of the skirt gives it a relative flexibility which allows the skirt to deform under the effect of shocks and vibrations when the protective casing is used. This allows the evacuation of debris stuck in the passage space between the first and second parts or having penetrated inside the protective casing.
  • the cover skirt extends over the entire periphery of the corresponding part.
  • the pressure measurement box includes a box filling orifice intended to be closed by an electrically conductive closure member to which an antenna is connected.
  • the shutter member performs both the function of shuttering the casing and of conducting the electrical signal generated inside the casing to the antenna situated outside the casing.
  • the wall of the casing is formed by a deformable diaphragm.
  • a diaphragm has suitable mechanical deformation characteristics enabling it to be sensitive to the pressure of the tire and to its variations.
  • the wall of the casing has concentric grooves.
  • the concentric grooves are equidistant from each other in pairs.
  • the wall of the sealed casing has, in section, at least one portion having a substantially sinusoidal profile. This makes it possible to improve the linearity of response of a test body of the measuring member with respect to a wall of the sealed casing having, in section, a substantially planar profile.
  • the device 10 comprises a pressure measuring member 12 and a casing 14 for protecting the measuring member 12 according to a first embodiment of the invention.
  • the device 10 also comprises means 16 for securing the protective casing 14 to an internal surface 17 of a tire 18.
  • the tire 18 is used for civil engineering applications.
  • the protective casing 14 comprises first and second parts 20, 22.
  • the device 10 comprises a support 24 for positioning of the member 12 in the housing 14.
  • the parts 20, 22 are movable, in this case separable, relative to each other and arranged so that they allow air communication between the outside and the interior of the casing 14 when they are assembled, for example by a space between the two parts 20, 22.
  • the parts 20, 22 are movable relative to each other between a position of insertion of the member 12 in the housing 14 ( figure 3 , 5, 6 ) and a holding position of the member 12 in the housing 14 ( figure 2 , 4 ).
  • the box 14 has a generally parallelepipedal shape.
  • the housing 14 comprises means 26 for securing the first and second parts to each other as well as means 27 for bracing the first and second parts with respect to each other.
  • the housing 14 comprises means 28 for guiding the means 16 and means 30 for attaching the means 16.
  • the housing 14 comprises means 31 for the dimensional filtration of the air entering the housing 14.
  • the first part 20 has a generally parallelepipedic shape and is delimited by four protective walls 32a-d parallel in pairs.
  • the walls 32a-d are connected by a protective wall 34 at the bottom.
  • the bottom wall 34 has a depression 36 forming a housing.
  • Each wall 32a-d forms a stepped skirt 33 comprising a portion 32a1-d1 extended by a portion 30a2-d2 forming a covering skirt 35 of the second part 22.
  • the covering skirt 35 extends over the entire periphery of the first part 20.
  • the means for securing 26 and bracing 27 of the first part 20 comprise legs 38 provided with through holes for the passage of screws.
  • the guide means 28 of the first part 20 comprise two ribs 36a-b connecting two opposite walls 32a-c and passing through the bottom wall 34 on the external face of the casing 14.
  • the means 30 comprise a protrusion 40 carried by the wall 34 and complementary to depression 36.
  • the device 10 comprises means 42 for positioning the support 24.
  • the second part 22 has a generally parallelepipedal shape and is delimited by four protective walls 46a-d parallel in pairs.
  • the walls 46a-d are connected by a protective wall 48 at the bottom.
  • the walls 32a-d and 46a-d have no protruding edges so as not to alter the securing means 26.
  • the securing means 26 and spacer 27 of the second part 22 comprise threaded through holes 50 extending the holes 38 and allowing screws to be locked.
  • the guide means 28 of the second part comprise two pairs of ribs 52a-b.
  • the ribs 52a-b are carried by two opposite walls 46a-c and are arranged in the extension of the ribs 36a-b.
  • the means of positioning 42 include polarizers 54 carried by the bottom wall 48.
  • the polarizers 54 include first and second types 54a, 54b of polarizers respectively having a cross and round shape.
  • the wall 48 carries a polarizer 54a of the first type and three polarizers 54b of the second type.
  • the dimensional filtration means 31 comprise ribs 56 extending perpendicular to the wall 48 and carried by the bottom wall 48.
  • the ribs 56 form a circle centered around an axis Z and are angularly spaced from each other.
  • the angular spacing between the ribs 56 is constant and makes it possible to limit the size of the objects that may eventually penetrate or accumulate inside the cylindrical volume delimited by the ribs 56.
  • the dimensional filtering means 31 also comprise a space 58 defined by the parts 20, 22. In this case, the space 58 is defined by the cover skirt 35 formed by the portions 32a2-d2 and the side walls 46a-d when the two parts 20, 22 are attached one to the other.
  • the space 58 has, in section, a general profile in the shape of an elbow between the interior and the exterior of the casing 14.
  • the distance separating the portions 32a2-d2 and the walls 46a-d is between 1 and 3 mm .
  • Cover skirt 35 includes a peripheral end edge 59.
  • Skirt 35 has a tapered profile. In other words, the skirt 35 has a variable thickness decreasing as one moves towards the edge 59.
  • the support 24 comprises a part 60 of generally circular shape centered around an axis Z' and feet 62, here four, carrying the part 60 distributed regularly around the part 60.
  • the device 10 comprises means 64 for holding the the member 12 in the support 24.
  • the holding means 64 comprise first and second radial walls 70a, 70b extending circumferentially over a predetermined angular width.
  • the walls 70a are offset axially along the axis Z' with respect to the walls 70b.
  • the means 64 also include a notch 72 for positioning the member 12 relative to the support 24.
  • Positioning means 42 include keying pins 74, complementary to keying pins 54, carried by each foot 62.
  • Keying pins 74 include first and second types 74a, 74b of keying pins respectively having a cross and round shape.
  • One foot carries a keying device 74a of the first type and each other foot carries a keying device 74b of the second type.
  • the support 24 is made of plastic material, for example polyvinylidene fluoride. This material is flexible enough to allow the member 12 to be inserted into the support 24 by elastic deformation of the support 24.
  • the fastening means 16 comprise a patch 76 and a retaining strip 78.
  • the strip 78 comprises an elastic portion 80 connecting together two complementary attachment portions 82, 84 of the hook-velvet type known under the VELCRO brand.
  • Each portion 82, 84 also comprises an opening 86 for holding the strip 78 having a shape and dimensions substantially identical to the shape and dimensions of the protrusion 40.
  • the patch 76 comprises a face 88 for securing with the tire 18 and intended to be glued against the internal surface 17.
  • the patch 76 also comprises a face 90 and a strap 92 for securing the patch 76 with the band 78.
  • the face 90 and the strap 92 delimit a space 94 for the passage of the band 78.
  • the strip 78 When mounting the device 10 on the tire 18, the strip 78 is passed through the space 94. Then, the housing 14 is placed on the strap 92. The strip 78 is passed between the guide ribs 36a-b of the the strip 78 and the protrusion 40 is inserted successively into each opening 86 as shown in the figure 1 .
  • the member 12 has a generally cylindrical shape of revolution about an axis Z".
  • the member 12 comprises a test body 96 carrying a deformable surface 98 sensitive to pressure.
  • the test body 96 subjected to the pressure to be measured transforms it into another physical quantity such as a deformation, a displacement, etc.
  • the member 12 comprises means 99 for processing the pressure detected by the test body 96.
  • the means 99 notably comprise a micro-controller.
  • the means 99 are sensitive to the physical magnitude and intended to convert this detected magnitude, for example into an electronic signal.
  • the member 12 also comprises means 101 for storing energy, in species a stack.
  • the member 12 also comprises a sealed casing 100.
  • the box 100 comprises a support 102 of the test body 96 as well as a deformable wall 104 formed by a deformable diaphragm carrying a deformable surface 106 for measuring pressure.
  • the diaphragm 104 is attached to the support 102 by welding or by gluing.
  • the box 100 delimits an internal space E.
  • the test body 96 and the means 99, 101 are arranged in the box 100.
  • the sealed casing 100 is impermeable to liquids, solids and gases under the conditions of use of the member 12 inside the tire.
  • the test body 96 is therefore protected from chemical attacks, in particular from those originating from the products used for the maintenance of rims and tires, in particular in the field of civil engineering. Thus, the test body 96 cannot be damaged by any element external to the casing because it is located in the sealed casing 100.
  • the measuring device 12 is of the active type. Thus, it is not necessary to calibrate it. Each member 12 can therefore be manufactured at lower cost and quickly. Furthermore, the pressure measured by the test body 96 is transmitted to the processing means which are powered autonomously by the energy storage means. The data is then transmitted from the processing means to the outside of the organ. The measuring member 12 is therefore autonomous, energy independent and capable of reliably transmitting the measured pressure.
  • the device 12 comprises means 108 for communication by radiofrequency of data acquired by the device 12, in particular of the quantity measured by the test body 96 and processed by the processing means 99.
  • the device 12 comprises means 110 for transmitting the pressure between the pressure measurement surface 106 of the diaphragm 104 and the deformable surface 98 of the test body 96.
  • the member 12 comprises means 112 for filling the housing 100 as well as means 114 for closure of the filling means 112.
  • the test body 96 comprises an element of the strain gauge type capable of transforming the deformation undergone by the deformable surface 98 into an electrical signal intended for the processing means 99.
  • the test body 96 includes a piezoelectric type element.
  • the surface 106 is functionally linked to the test body 96, in this case to the surface 98, so that when pressure is exerted on the surface 106, this pressure is transmitted to the test body 96, in the species on the surface 98.
  • the member 12 makes it possible to measure the internal pressure of the tire thanks to the pressure measurement surface 106 which, by being functionally linked to the test body 96, transmits the pressure to the test body 96 without that -ci is exposed to elements outside the housing 14.
  • the wall 104 of the housing is deformable so that the pressure received by this wall 104 outside the housing is measurable by the test body 96.
  • Such a member 12 is intended to be arranged in the space delimited by the tire and the rim. It can either be attached to the rim or to the tire.
  • the transmission means 110 are intended to transmit the pressure exerted on the pressure measurement surface 106 to the deformable surface 98.
  • the diaphragm 104 has a general spheroid shape flattened at its top.
  • the diaphragm 104 comprises concentric circular portions 118 separated from one another by circular grooves 120 concentric.
  • the grooves 120 are equidistant from each other in pairs.
  • the wall 104 of the sealed case 100 has, in section, at least one portion having a substantially sinusoidal profile.
  • the diaphragm 104 is made of stainless steel and the surface 106 is coated with an inert metallic film, for example gold, palladium or platinum.
  • This layer makes it possible to prevent corrosion of the diaphragm 104 and to preserve its mechanical characteristics.
  • Support 102 forms a wall of housing 100 and is made of ceramic.
  • the support 102 being made of ceramic, it is perfectly sealed and inert vis-à-vis chemical attacks, in particular those originating from products used for the maintenance of rims and tires, in particular in the field of civil engineering.
  • cracks are liable to appear following the expansion of the material of the support 102 following the temperature variations in the tire. Since the ceramic exhibits very low expansion, the appearance and expansion of cracks in the support 102 is minimized.
  • the device 12 comprises an electronic circuit 122 of copper tracks etched in the support 102.
  • the support 102 carries the processing means 99 which are connected to the test body 96, to the transmission means 108 and to the data storage means. energy 101 via circuit 122.
  • the communication means 108 comprise an antenna 124 of the helical type. This type of antenna makes it possible to obtain relatively effective radiation in a small volume.
  • the antenna 124 is located outside the internal space E.
  • the antenna 124 being located outside the internal space E, its radiation properties are preserved and are not altered by the housing 14 of pressure measurement or material 136.
  • the member 12 also comprises a housing 126 for protecting the antenna 124 in which the latter is encapsulated.
  • the box 126 is attached to the box 100, here the support 102, and is made of a material having a dielectric constant between 1 and 5, for example thermosetting polyurethane. Such a material makes it possible to protect the antenna from chemical attacks, in particular from those originating from products used for the maintenance of rims and tires, in particular in the field of civil engineering, and likely to be present inside the tire.
  • the filling means 112 comprise an orifice 128 for filling the housing 100 formed in the support 102.
  • the orifice 128 is closed off by the closing means 114, in this case by a closing member 130 force-screwed into a thread 132 carried by the support 102.
  • the member 130 comprises an orifice 134 for holding the antenna 124 and is made of an electrically conductive material in order to transmit electrical signals from the inside of the housing 14 to the outside of the housing 14.
  • the member 130 is made of a material allowing the welding of the antenna 124 in the orifice 134.
  • the member 130 is therefore electrically connected and mechanically to the antenna 124.
  • the filling of the housing 100 is carried out with a product in the liquid phase, under vacuum, at a temperature between 50° C. and 80° C. in order to ensure perfect penetration of the product into the entire space E, including the spaces between the electronic components of circuit 122.
  • the box 100 is filled with a product at a first temperature of between 50°C and 80°C.
  • This product is crosslinkable. At this temperature and during this filling step, the product is in a liquid phase.
  • the product can be mono-component, bi-component or multi-component.
  • the product is left to cure at a second temperature.
  • the product then forms a material in a gel phase.
  • the product is left to cure at the first temperature.
  • the transmission means 110 comprise a substantially incompressible material 136 occupying the entire internal space E.
  • the member 12 By occupying all of the internal space E, the presence of air or of another material, for example compressible, which could disturb the pressure detected by the test body 96, in particular during temperature variations, is excluded.
  • the member 12 makes it possible to measure pressures that can range up to 16 bars, or even 30 bars if necessary.
  • the incompressibility of the material 136 is defined at constant temperature.
  • an incompressible material can have a variable volume depending on the temperature.
  • the deformability of the pressure measurement wall 106 makes it possible to adapt the pressure measurement to temperature variations. Indeed, when the temperature increases or decreases, the material 136 tends respectively to extend or to retract.
  • the deformability of the diaphragm 104 enables it to follow the variations in volume of the material as a function of the temperature without altering the pressure measurement.
  • the incompressible material of the member 12 makes it possible to prevent the implosion of the pressure measurement box 14 with respect to a member comprising a box comprising only air which would implode under the effect of the pressure difference between the exterior and interior of the case.
  • the incompressible material 136 is in a liquid and/or gel phase in a temperature range between -20°C and +150°C.
  • the material 136 remains in a liquid and/or gel phase in the range of operating temperatures of the member 12 and retains, in this range, its properties of direct pressure transmission from the pressure measurement surface 106 to 'At test body 96.
  • a gel presents an intermediate behavior between a liquid and a solid.
  • the material 136 is dielectric so that it does not interfere electrically with the electrical signals of the circuit 122, in particular the test body 96 or the detector 99.
  • the material is chosen from oils based on esters or glycerin.
  • the material used is known under the reference TSE 3062 manufactured by the company MOMENTIVE.
  • the means 64 comprise a tongue 140 for positioning the member 12. This tongue 140 is complementary to the notch 72 of the support 24.
  • the protective wall 48 faces the surface 106.
  • the support 24 and the housing 14 are arranged so that the pressure measurement surface 106 is positioned at a distance from the wall 48 of the housing. No wall of the housing is in contact with the surface 106 of pressure measurement.
  • the box 14 thus makes it possible to ensure that no force other than that linked to the air pressure of the tire will be exerted on the pressure measurement surface 106 .
  • the height of the support 24, here that of the radial walls 70b, is greater than the height of the diaphragm 104.
  • the axes Z, Z' and Z" are substantially coincident.
  • the ribs 56 also provide a stop function for the axial displacement of the support 24.
  • the feet 62 being flexible, they can bend.To prevent the pressure measurement surface 106 from touching the wall 48, the ribs 56 limit the axial displacement of the support 24 and therefore of the housing 100.
  • the pressure measurement surface 106 extends at a distance from the test body 96, that is to say not being directly in contact with the test body 96, the test body 96 cannot be worn or separated from its support 102 under the effect of repeated efforts on the pressure measurement surface 106.
  • the substantially incompressible material 136 makes it possible both to protect the test body 96 and both to directly transmit the pressure from the pressure measurement surface 106 to the test body 96 without these not be in direct contact.
  • the transmission of the pressure is carried out directly, that is to say that the pressure applied to the pressure measurement surface 106 is the pressure measured by the test body 96.
  • No offset in the measurement or off-set is introduced by the material 136, which makes it possible in particular to dispense with a calibration of the member 12.
  • FIG. 13 a device comprising a protective casing 14 according to a second embodiment of the invention. Elements similar to those shown in the preceding figures are designated by identical references.
  • the securing means 16 comprise a patch 142 bearing a male trapezoidal section slide 144 on its face 90.
  • the means 16 also comprise a female trapezoidal section slide 146 provided in the second part 22.
  • the device 10 according to the second embodiment also comprises means 148 for locking the housing 14 with the patch 142.
  • the locking means 148 comprise an oblong orifice 150 made in an ear 152 carried by one of the walls of the part 22.
  • the means 148 also include a pair 154 of elastic hooks intended to be inserted into the orifice 150 when the orifice 150 projects beyond a locking wall 156 of the male slide 144.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

L'invention concerne un boîtier de protection d'un organe (12) de mesure de pression d'un pneumatique qui comprend :
- des première et deuxième parties (20, 22) mobiles l'une par rapport à l'autre entre une position d'insertion de l'organe (12) dans le boîtier et une position de maintien de l'organe (12) dans le boîtier, les première et deuxième parties (20,22) étant agencées de sorte qu'elles permettent une communication d'air entre l'extérieur et l'intérieur du boîtier lorsqu'elles sont dans la position de maintien;
- des moyens (31) de filtration de l'air entrant dans le boîtier comprenant un espace (58) de passage de l'air entre l'extérieur et l'intérieur du boîtier défini par les première et deuxième parties (20, 22).The invention relates to a casing for protecting a tire pressure measurement device (12) which comprises:
- first and second parts (20, 22) movable relative to each other between a position for inserting the member (12) into the housing and a position for maintaining the member (12) in the casing, the first and second parts (20,22) being arranged so that they allow air communication between the exterior and the interior of the casing when they are in the holding position;
- means (31) for filtering the air entering the casing comprising a space (58) for the passage of air between the exterior and the interior of the casing defined by the first and second parts (20, 22) .

L'espace (58) de passage de l'air est défini au moins en partie par une jupe de recouvrement (35) d'une paroi latérale (46d) d'une des première et deuxième parties (20, 22).

Figure imgaf001
The air passage space (58) is defined at least in part by a covering skirt (35) of a side wall (46d) of one of the first and second parts (20, 22).
Figure imgaf001

Description

La présente invention concerne le domaine des capteurs de pression.The present invention relates to the field of pressure sensors.

L'invention s'applique, sans s'y restreindre, à la mesure de pression d'un pneumatique, notamment de type génie civil.The invention applies, without being restricted thereto, to measuring the pressure of a tire, in particular of the civil engineering type.

On connaît de l'état de la technique, notamment de US 6,931,934 , un organe de mesure de pression agencé à l'intérieur de l'espace délimité par le pneumatique et la jante. L'organe est de type passif et comprend un boîtier de protection. L'organe comprend également un corps d'épreuve et le boîtier comprend une paroi portant une surface de mesure de pression liée fonctionnellement au corps d'épreuve. En effet, cette paroi comporte un enfoncement agencé de sorte que la paroi est positionnée au contact du corps d'épreuve. Sous l'effet de la pression externe exercée sur la paroi, l'enfoncement transmet mécaniquement la pression au corps d'épreuve qui peut alors détecter la pression externe à l'organe.It is known from the state of the art, in particular from US 6,931,934 , a pressure measuring device arranged inside the space delimited by the tire and the rim. The organ is of the passive type and comprises a protective casing. The member also comprises a test body and the housing includes a wall bearing a pressure measurement surface functionally linked to the test body. Indeed, this wall comprises a depression arranged so that the wall is positioned in contact with the test body. Under the effect of the external pressure exerted on the wall, the depression mechanically transmits the pressure to the test body which can then detect the pressure external to the organ.

Toutefois, les efforts mécaniques répétés de l'enfoncement sur le corps d'épreuve au contact de ce dernier conduisent d'une part, à une usure du corps d'épreuve ce qui altère la mesure de pression, et d'autre part, à une désolidarisation du corps d'épreuve de son support ce qui rend l'organe inutilisable.However, the repeated mechanical forces of the depression on the test body in contact with the latter lead on the one hand to wear of the test body which alters the pressure measurement, and on the other hand to separation of the test body from its support, which renders the component unusable.

En outre, l'organe étant de type passif, chaque organe de mesure doit être étalonné à l'issue de sa fabrication qui est donc fastidieuse et coûteuse. Il requiert aussi une mémorisation des données d'étalonnage dans une unité de traitement de l'organe. Cela augmente la complexité et le coût du système. En outre, les données d'étalonnage sont une source d'erreurs de mesure.In addition, the member being of the passive type, each measuring member must be calibrated at the end of its manufacture, which is therefore tedious and expensive. It also requires storage of the calibration data in a processing unit of the organ. This increases the complexity and cost of the system. Also, calibration data is a source of measurement error.

Il est à noter également que dans le cas où l'organe n'est pas fermé de façon complètement étanche pendant toute sa durée de vie, il n'est pas protégé des agressions chimiques, notamment de celles provenant des produits utilisés pour l'entretien des jantes et du pneumatique. Cette exposition prolongée aux agressions chimiques engendre une altération du corps d'épreuve et donc de la mesure de pression.It should also be noted that if the component is not completely sealed for its entire life, it is not protected from chemical attacks, in particular those from products used for maintenance. rims and tires. This prolonged exposure to chemical attacks causes an alteration of the test body and therefore of the pressure measurement.

L'invention vise à fournir un organe de mesure de pression fiable.The invention aims to provide a reliable pressure measuring device.

Lorsqu'il est positionné dans le pneumatique, l'organe de mesure de pression subit les agressions des débris solides et liquides présents dans le pneumatique. En particulier, des débris peuvent venir au contact de la surface de mesure de pression et perturber la fiabilité de la mesure. Il est donc nécessaire de protéger l'organe de mesure de pression tout en permettant une mesure fiable de la pression du pneumatique.When it is positioned in the tire, the pressure-measuring member is subjected to attack by solid and liquid debris present in the tire. In particular, debris can come into contact with the pressure measurement surface and disturb the reliability of the measurement. It is therefore necessary to protect the pressure measuring member while allowing reliable measurement of the pressure of the tire.

A cet effet, l'invention a pour objet un boîtier de protection d'un orange de mesure de pression d'un pneumatique selon la revendication 1.To this end, the subject of the invention is a casing for protecting a tire pressure measurement orange according to claim 1.

Le boîtier de protection permet de protéger l'organe, notamment la surface de mesure de pression des chocs et de certains débris solides, par exemple des cailloux.The protective casing makes it possible to protect the member, in particular the pressure measurement surface, from shocks and certain solid debris, for example pebbles.

Le boîtier permet ainsi à l'air mis sous pression dans le pneumatique de pénétrer dans le boîtier de protection afin que la pression puisse être détectée par la surface de mesure de pression.The housing thus allows the air pressurized in the tire to penetrate into the protective housing so that the pressure can be detected by the pressure measurement surface.

.Un tel boîtier permet de protéger à moindre coût et efficacement l'organe de mesure de pression. En effet, grâce à l'espace, l'air est filtré dimensionnellement, c'est-à-dire que seuls les liquides et les solides de taille inférieure à l'espace de passage peuvent pénétrer à l'intérieur du boîtier de protection. Le boîtier de protection permet ainsi de protéger la surface de mesure de pression des chocs et de certains débris solides..Such a case makes it possible to protect the pressure measuring member inexpensively and effectively. Indeed, thanks to the space, the air is filtered dimensionally, that is to say that only liquids and solids smaller in size than the passage space can penetrate inside the protective box. The protective casing thus makes it possible to protect the pressure measurement surface from shocks and certain solid debris.

En outre, le passage étant délimité par les première et deuxième parties, il n'est pas nécessaire de prévoir de passage de l'air propre à chacune des parties. Le passage est formé lors de l'assemblage du boîtier dans sa position de maintien de l'organe.In addition, the passage being delimited by the first and second parts, it is not necessary to provide a passage for the air specific to each of the parts. The passage is formed during assembly of the housing in its position for holding the member.

Grâce au fait que l'espace de passage de l'air soit défini au moins en partie par une jupe de recouvrement de la paroi latérale, l'espace de passage permet de maintenir un passage de l'air entre l'intérieur et l'extérieur du boîtier de protection, même si l'espace de passage est bouché par des débris à quelques endroits isolés. En effet, il est très improbable que la totalité de l'espace de passage soit bouché si bien qu'il existe toujours un passage d'air entre l'intérieur et l'extérieur du boîtier permettant ainsi de mesurer correctement la pression du pneumatique.Thanks to the fact that the air passage space is defined at least in part by a skirt covering the side wall, the passage space makes it possible to maintain an air passage between the interior and the exterior of the protective enclosure, even if the passage space is clogged with debris in a few isolated places. Indeed, it is very unlikely that the entire passage space will be blocked so that there is always an air passage between the inside and the outside of the box, thus making it possible to measure the pressure of the tire correctly.

De façon optionnelle, le boîtier comprend des moyens d'entretoisement entre les première et deuxième parties. Les moyens d'entretroisement permettent, dans la position de maintien, de définir l'espace de passage de l'air.Optionally, the box includes spacer means between the first and second parts. The interlocking means make it possible, in the holding position, to define the air passage space.

De préférence, l'espace de passage présente, en coupe, un profil général en forme de coude entre l'intérieur et l'extérieur du boîtier.Preferably, the passage space has, in section, a general profile in the shape of an elbow between the inside and the outside of the casing.

Avantageusement, la jupe de recouvrement présente un profil effilé. L'effilage de la jupe lui confère une relative souplesse qui permet à la jupe de se déformer sous l'effet des chocs et des vibrations lorsqu'on utilise le boîtier de protection. On permet ainsi l'évacuation de débris coincés dans l'espace de passage entre les première et deuxième parties ou bien ayant pénétré à l'intérieur du boîtier de protection.Advantageously, the cover skirt has a tapered profile. The tapering of the skirt gives it a relative flexibility which allows the skirt to deform under the effect of shocks and vibrations when the protective casing is used. This allows the evacuation of debris stuck in the passage space between the first and second parts or having penetrated inside the protective casing.

De préférence, la jupe de recouvrement s'étend sur la totalité de la périphérie de la partie correspondante.Preferably, the cover skirt extends over the entire periphery of the corresponding part.

Optionnellement, le boîtier de mesure de pression comporte un orifice de remplissage du boîtier destiné à être obturé par un organe d'obturation électriquement conducteur auquel est reliée une antenne. L'organe d'obturation assure à la fois la fonction d'obturation du boîtier et de conduction du signal électrique généré à l'intérieur du boîtier vers l'antenne située à l'extérieur du boîtier.Optionally, the pressure measurement box includes a box filling orifice intended to be closed by an electrically conductive closure member to which an antenna is connected. The shutter member performs both the function of shuttering the casing and of conducting the electrical signal generated inside the casing to the antenna situated outside the casing.

Avantageusement, la paroi du boîtier est formée par un diaphragme déformable. Un diaphragme présente des caractéristiques mécaniques de déformation adaptées lui permettant d'être sensible à la pression du pneumatique et à ses variations.Advantageously, the wall of the casing is formed by a deformable diaphragm. A diaphragm has suitable mechanical deformation characteristics enabling it to be sensitive to the pressure of the tire and to its variations.

Avantageusement, la paroi du boîtier comporte des rainures concentriques.Advantageously, the wall of the casing has concentric grooves.

De préférence, les rainures concentriques sont équidistantes les unes des autres deux à deux. Préférentiellement, la paroi du boîtier étanche présente, en coupe, au moins une portion présentant un profil sensiblement sinusoïdal. Cela permet d'améliorer la linéarité de réponse d'un corps d'épreuve de l'organe de mesure par rapport à une paroi du boîtier étanche présentant, en coupe, un profil sensiblement plan.Preferably, the concentric grooves are equidistant from each other in pairs. Preferably, the wall of the sealed casing has, in section, at least one portion having a substantially sinusoidal profile. This makes it possible to improve the linearity of response of a test body of the measuring member with respect to a wall of the sealed casing having, in section, a substantially planar profile.

L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple non limitatif et faite en se référant aux dessins dans lesquels :

  • la figure 1 illustre un dispositif de mesure de pression comprenant un boîtier de protection selon un premier mode de réalisation de l'invention rapporté sur un pneumatique;
  • la figure 2 est une vue en perspective du dispositif de la figure 1 ;
  • la figure 3 est une vue éclatée en perspective du dispositif de la figure 2;
  • la figure 4 est une vue en coupe du dispositif de la figure 2;
  • les figures 5 et 6 sont des vues en perspective de première et deuxième parties d'un boîtier du dispositif des figures 1 à 4;
  • la figure 7 est une vue en perspective d'un support du dispositif des figures 1 à 4;
  • les figures 8 et 9 illustrent des moyens de solidarisation du boîtier de protection des figures 2 à 4 sur le pneumatique;
  • la figure 10 est une vue en coupe d'un organe du dispositif des figures 3 et 4;
  • les figures 11 et 12 sont des vues en perspective de l'organe de la figure 10;
  • la figure 13 illustre un dispositif de mesure de pression comprenant un boîtier de protection selon un second mode de réalisation de l'invention.
The invention will be better understood on reading the following description, given solely by way of non-limiting example and made with reference to the drawings in which:
  • there figure 1 illustrates a pressure measuring device comprising a protective casing according to a first embodiment of the invention attached to a tire;
  • there picture 2 is a perspective view of the device of the figure 1 ;
  • there picture 3 is an exploded perspective view of the device of the figure 2 ;
  • there figure 4 is a sectional view of the device of the picture 2 ;
  • THE figures 5 and 6 are perspective views of first and second parts of a housing of the device of the figures 1 to 4 ;
  • there figure 7 is a perspective view of a support of the device of the figures 1 to 4 ;
  • THE figures 8 and 9 illustrate means for securing the protective casing of the figures 2 to 4 on the tire;
  • there figure 10 is a sectional view of a member of the device of the figure 3 And 4 ;
  • THE figures 11 and 12 are perspective views of the body of the figure 10 ;
  • there figure 13 illustrates a pressure measuring device comprising a protective casing according to a second embodiment of the invention.

On a représenté sur la figure 1 un dispositif désigné par la référence générale 10. Le dispositif 10 comprend un organe de mesure de pression 12 et un boîtier 14 de protection de l'organe de mesure 12 selon un premier mode de réalisation de l'invention. Le dispositif 10 comprend également des moyens 16 de solidarisation du boîtier de protection 14 sur une surface interne 17 d'un pneumatique 18. Le pneumatique 18 est utilisé pour des applications de génie civil.We represented on the figure 1 a device designated by the general reference 10. The device 10 comprises a pressure measuring member 12 and a casing 14 for protecting the measuring member 12 according to a first embodiment of the invention. The device 10 also comprises means 16 for securing the protective casing 14 to an internal surface 17 of a tire 18. The tire 18 is used for civil engineering applications.

En référence aux figures 2 à 4, le boîtier de protection 14 comprend des première et deuxième parties 20, 22. Le dispositif 10 comprend un support 24 de positionnement de l'organe 12 dans le boîtier 14. Les parties 20, 22 sont mobiles, en l'espèce séparables, l'une par rapport à l'autre et agencées de sorte qu'elles permettent une communication d'air entre l'extérieur et l'intérieur du boîtier 14 lorsqu'elles sont assemblées, par exemple par un espace entre les deux parties 20, 22. Les parties 20, 22 sont mobiles l'une part rapport à l'autre entre une position d'insertion de l'organe 12 dans le boîtier 14 (figures 3, 5, 6) et une position de maintien de l'organe 12 dans le boîtier 14 (figures 2, 4). Le boîtier 14 présente une forme générale parallélépipédique. Le boîtier 14 comprend des moyens 26 de solidarisation des première et deuxième parties entre elles ainsi que des moyens d'entretoisement 27 des première et deuxième parties l'une par rapport à l'autre. Le boîtier 14 comprend des moyens 28 de guidage des moyens 16 et des moyens 30 d'accrochage des moyens 16. Enfin, le boîtier 14 comprend des moyens 31 de filtration dimensionnelle de l'air entrant dans le boîtier 14.With reference to figures 2 to 4 , the protective casing 14 comprises first and second parts 20, 22. The device 10 comprises a support 24 for positioning of the member 12 in the housing 14. The parts 20, 22 are movable, in this case separable, relative to each other and arranged so that they allow air communication between the outside and the interior of the casing 14 when they are assembled, for example by a space between the two parts 20, 22. The parts 20, 22 are movable relative to each other between a position of insertion of the member 12 in the housing 14 ( figure 3 , 5, 6 ) and a holding position of the member 12 in the housing 14 ( figure 2 , 4 ). The box 14 has a generally parallelepipedal shape. The housing 14 comprises means 26 for securing the first and second parts to each other as well as means 27 for bracing the first and second parts with respect to each other. The housing 14 comprises means 28 for guiding the means 16 and means 30 for attaching the means 16. Finally, the housing 14 comprises means 31 for the dimensional filtration of the air entering the housing 14.

En référence aux figures 4 et 5, la première partie 20 présente une forme générale parallélépipédique et est délimitée par quatre parois de protection 32a-d parallèles deux à deux. Les parois 32a-d sont reliées par une paroi de protection 34 de fond. La paroi de fond 34 comporte un enfoncement 36 formant un logement. Chaque paroi 32a-d forme une jupe étagée 33 comportant une portion 32a1-d1 prolongée par une portion 30a2-d2 formant une jupe 35 de recouvrement de la deuxième partie 22. La jupe de recouvrement 35 s'étend sur la totalité de la périphérie de la première partie 20.With reference to figures 4 and 5 , the first part 20 has a generally parallelepipedic shape and is delimited by four protective walls 32a-d parallel in pairs. The walls 32a-d are connected by a protective wall 34 at the bottom. The bottom wall 34 has a depression 36 forming a housing. Each wall 32a-d forms a stepped skirt 33 comprising a portion 32a1-d1 extended by a portion 30a2-d2 forming a covering skirt 35 of the second part 22. The covering skirt 35 extends over the entire periphery of the first part 20.

Les moyens de solidarisation 26 et d'entretoisement 27 de la première partie 20 comprennent des jambes 38 munies d'orifices traversants pour le passage de vis. Les moyens de guidage 28 de la première partie 20 comprennent deux nervures 36a-b reliant deux parois opposées 32a-c et passant par la paroi de fond 34 sur la face externe du boîtier 14. Les moyens 30 comprennent une excroissance 40 portée par la paroi 34 et complémentaire de l'enfoncement 36.The means for securing 26 and bracing 27 of the first part 20 comprise legs 38 provided with through holes for the passage of screws. The guide means 28 of the first part 20 comprise two ribs 36a-b connecting two opposite walls 32a-c and passing through the bottom wall 34 on the external face of the casing 14. The means 30 comprise a protrusion 40 carried by the wall 34 and complementary to depression 36.

En référence à la figure 6, le dispositif 10 comprend des moyens 42 de positionnement du support 24. La deuxième partie 22 présente une forme générale parallélépipédique et est délimitée par quatre parois de protection 46a-d parallèles deux à deux. Les parois 46a-d sont reliées par une paroi de protection 48 de fond. Les parois 32a-d et 46a-d sont dépourvues d'arêtes saillantes de façon à ne pas altérer les moyens de solidarisation 26.With reference to the figure 6 , the device 10 comprises means 42 for positioning the support 24. The second part 22 has a generally parallelepipedal shape and is delimited by four protective walls 46a-d parallel in pairs. The walls 46a-d are connected by a protective wall 48 at the bottom. The walls 32a-d and 46a-d have no protruding edges so as not to alter the securing means 26.

Les moyens de solidarisation 26 et d'entretoisement 27 de la deuxième partie 22 comprennent des orifices traversant 50 taraudés prolongeant les orifices 38 et permettant le verrouillage de vis. Les moyens de guidage 28 de la deuxième partie comprennent deux paires de nervures 52a-b. Les nervures 52a-b sont portées par deux parois 46a-c opposées et sont disposées dans le prolongement des nervures 36a-b. Les moyens de positionnement 42 comprennent des détrompeurs 54 portés par la paroi de fond 48. Les détrompeurs 54 comprennent des premier et deuxième types 54a, 54b de détrompeurs présentant respectivement une forme en croix et en rond. La paroi 48 porte un détrompeur 54a du premier type et trois détrompeurs 54b du deuxième type.The securing means 26 and spacer 27 of the second part 22 comprise threaded through holes 50 extending the holes 38 and allowing screws to be locked. The guide means 28 of the second part comprise two pairs of ribs 52a-b. The ribs 52a-b are carried by two opposite walls 46a-c and are arranged in the extension of the ribs 36a-b. The means of positioning 42 include polarizers 54 carried by the bottom wall 48. The polarizers 54 include first and second types 54a, 54b of polarizers respectively having a cross and round shape. The wall 48 carries a polarizer 54a of the first type and three polarizers 54b of the second type.

Les moyens de filtration dimensionnelle 31 comprennent des nervures 56 s'étendant perpendiculairement à la paroi 48 et portées par la paroi de fond 48. Les nervures 56 forment un cercle centré autour d'un axe Z et sont espacées angulairement les unes des autres. L'espacement angulaire entre les nervures 56 est constant et permet de limiter la taille des objets pouvant éventuellement pénétrer ou s'accumuler à l'intérieur du volume cylindrique délimité par les nervures 56. Les moyens 31 de filtrage dimensionnel comprennent également un espace 58 défini par les parties 20, 22. En l'espèce, l'espace 58 est défini par la jupe de recouvrement 35 formée par les portions 32a2-d2 et les parois latérales 46a-d lorsque les deux parties 20, 22 sont rapportées l'une à l'autre. Comme représenté sur la figure 4, l'espace 58 présente, en coupe, un profil général en forme de coude entre l'intérieur et l'extérieur du boîtier 14. La distance séparant les portions 32a2-d2 et les parois 46a-d est comprise entre 1 et 3 mm.The dimensional filtration means 31 comprise ribs 56 extending perpendicular to the wall 48 and carried by the bottom wall 48. The ribs 56 form a circle centered around an axis Z and are angularly spaced from each other. The angular spacing between the ribs 56 is constant and makes it possible to limit the size of the objects that may eventually penetrate or accumulate inside the cylindrical volume delimited by the ribs 56. The dimensional filtering means 31 also comprise a space 58 defined by the parts 20, 22. In this case, the space 58 is defined by the cover skirt 35 formed by the portions 32a2-d2 and the side walls 46a-d when the two parts 20, 22 are attached one to the other. As shown on the figure 4 , the space 58 has, in section, a general profile in the shape of an elbow between the interior and the exterior of the casing 14. The distance separating the portions 32a2-d2 and the walls 46a-d is between 1 and 3 mm .

La jupe de recouvrement 35 comprend un bord périphérique d'extrémité 59. La jupe 35 présente un profil effilé. En d'autres termes, la jupe 35 présente une épaisseur variable diminuant lorsqu'on se déplace vers le bord 59.Cover skirt 35 includes a peripheral end edge 59. Skirt 35 has a tapered profile. In other words, the skirt 35 has a variable thickness decreasing as one moves towards the edge 59.

En référence à la figure 7, le support 24 comprend une partie 60 de forme générale circulaire centrée autour d'un axe Z' et des pieds 62, ici quatre, portant la partie 60 répartis régulièrement autour de la partie 60. Le dispositif 10 comprend des moyens 64 de maintien de l'organe 12 dans le support 24.With reference to the figure 7 , the support 24 comprises a part 60 of generally circular shape centered around an axis Z' and feet 62, here four, carrying the part 60 distributed regularly around the part 60. The device 10 comprises means 64 for holding the the member 12 in the support 24.

Les moyens de maintien 64 comprennent des premières et deuxièmes parois radiales 70a, 70b s'étendant circonférentiellement sur une largeur angulaire prédéterminée. Les parois 70a sont décalées axialement suivant l'axe Z' par rapport aux parois 70b. Les moyens 64 comprennent également une encoche 72 de positionnement de l'organe 12 par rapport au support 24.The holding means 64 comprise first and second radial walls 70a, 70b extending circumferentially over a predetermined angular width. The walls 70a are offset axially along the axis Z' with respect to the walls 70b. The means 64 also include a notch 72 for positioning the member 12 relative to the support 24.

Les moyens de positionnement 42 comprennent des détrompeurs 74, complémentaires des détrompeurs 54, portés par chaque pied 62. Les détrompeurs 74 comprennent des premier et deuxième types 74a, 74b de détrompeurs présentant respectivement une forme en croix et en rond. Un pied porte un détrompeur 74a du premier type et chaque autre pied porte un détrompeur 74b du deuxième type.Positioning means 42 include keying pins 74, complementary to keying pins 54, carried by each foot 62. Keying pins 74 include first and second types 74a, 74b of keying pins respectively having a cross and round shape. One foot carries a keying device 74a of the first type and each other foot carries a keying device 74b of the second type.

Le support 24 est réalisé en matière plastique, par exemple en fluorure de polyvinylidène. Cette matière est suffisamment souple pour permettre d'insérer l'organe 12 dans le support 24 par déformation élastique du support 24.The support 24 is made of plastic material, for example polyvinylidene fluoride. This material is flexible enough to allow the member 12 to be inserted into the support 24 by elastic deformation of the support 24.

En référence aux figures 1, 8 et 9, les moyens de solidarisation 16 comprennent un patch 76 et une bande de maintien 78. La bande 78 comprend une portion élastique 80 reliant entre elles deux portions d'accrochage complémentaires 82, 84 de type crochets-velours connu sous la marque VELCRO. Chaque portion 82, 84 comprend également une ouverture 86 de maintien de la bande 78 présentant une forme et des dimensions sensiblement identiques à la forme et aux dimensions de l'excroissance 40.With reference to figure 1 , 8 and 9 , the fastening means 16 comprise a patch 76 and a retaining strip 78. The strip 78 comprises an elastic portion 80 connecting together two complementary attachment portions 82, 84 of the hook-velvet type known under the VELCRO brand. Each portion 82, 84 also comprises an opening 86 for holding the strip 78 having a shape and dimensions substantially identical to the shape and dimensions of the protrusion 40.

Le patch 76 comprend une face 88 de solidarisation avec le pneumatique 18 et destinée à être collée contre la surface interne 17. Le patch 76 comprend également une face 90 et une bretelle 92 de solidarisation du patch 76 avec la bande 78. La face 90 et la bretelle 92 délimitent un espace 94 de passage de la bande 78.The patch 76 comprises a face 88 for securing with the tire 18 and intended to be glued against the internal surface 17. The patch 76 also comprises a face 90 and a strap 92 for securing the patch 76 with the band 78. The face 90 and the strap 92 delimit a space 94 for the passage of the band 78.

Lors du montage du dispositif 10 sur le pneumatique 18, on fait passer la bande 78 dans l'espace 94. Puis, on dispose le boîtier 14 sur la bretelle 92. On fait passer la bande 78 entre les nervures 36a-b de guidage de la bande 78 et on insère l'excroissance 40 successivement dans chaque ouverture 86 comme représenté sur la figure 1.When mounting the device 10 on the tire 18, the strip 78 is passed through the space 94. Then, the housing 14 is placed on the strap 92. The strip 78 is passed between the guide ribs 36a-b of the the strip 78 and the protrusion 40 is inserted successively into each opening 86 as shown in the figure 1 .

En référence aux figures 10 à 12, l'organe 12 présente une forme générale cylindrique de révolution autour d'un axe Z". L'organe 12 comprend un corps d'épreuve 96 portant une surface déformable 98 sensible à la pression. De façon classique, le corps d'épreuve 96 soumis à la pression à mesurer la transforme en une autre grandeur physique telle qu'une déformation, un déplacement, etc. En outre, l'organe 12 comprend des moyens de traitement 99 de la pression détectée par le corps d'épreuve 96. Les moyens 99 comprennent notamment un micro-contrôleur. Les moyens 99 sont sensibles à la grandeur physique et destinés à convertir cette grandeur détectée, par exemple en un signal électronique. L'organe 12 comprend également des moyens 101 de stockage d'énergie, en l'espèce une pile.With reference to figures 10 to 12 , the member 12 has a generally cylindrical shape of revolution about an axis Z". The member 12 comprises a test body 96 carrying a deformable surface 98 sensitive to pressure. Conventionally, the test body 96 subjected to the pressure to be measured transforms it into another physical quantity such as a deformation, a displacement, etc. In addition, the member 12 comprises means 99 for processing the pressure detected by the test body 96. The means 99 notably comprise a micro-controller.The means 99 are sensitive to the physical magnitude and intended to convert this detected magnitude, for example into an electronic signal.The member 12 also comprises means 101 for storing energy, in species a stack.

L'organe 12 comprend également un boîtier 100 étanche. Le boîtier 100 comprend un support 102 du corps d'épreuve 96 ainsi qu'une paroi déformable 104 formée par un diaphragme déformable portant une surface déformable 106 de mesure de pression. Le diaphragme 104 est rapporté sur le support 102 par soudure ou par collage. Le boîtier 100 délimite un espace interne E. Le corps d'épreuve 96 et les moyens 99, 101 sont agencés dans le boîtier 100.The member 12 also comprises a sealed casing 100. The box 100 comprises a support 102 of the test body 96 as well as a deformable wall 104 formed by a deformable diaphragm carrying a deformable surface 106 for measuring pressure. The diaphragm 104 is attached to the support 102 by welding or by gluing. The box 100 delimits an internal space E. The test body 96 and the means 99, 101 are arranged in the box 100.

Le boîtier 100 étanche est imperméable aux liquides, solides et gaz dans des conditions d'utilisation de l'organe 12 à l'intérieur du pneumatique. Le corps d'épreuve 96 est donc protégé des agressions chimiques, notamment de celles provenant des produits utilisés pour l'entretien des jantes et pneumatiques, notamment dans le domaine du génie civil. Ainsi, le corps d'épreuve 96 ne peut être détérioré par aucun élément extérieur au boîtier car il est situé dans le boîtier étanche 100.The sealed casing 100 is impermeable to liquids, solids and gases under the conditions of use of the member 12 inside the tire. The test body 96 is therefore protected from chemical attacks, in particular from those originating from the products used for the maintenance of rims and tires, in particular in the field of civil engineering. Thus, the test body 96 cannot be damaged by any element external to the casing because it is located in the sealed casing 100.

De plus, l'organe de mesure 12 est du type actif. Ainsi, il n'est pas nécessaire de l'étalonner. Chaque organe 12 peut donc être fabriqué à moindres coûts et rapidement. En outre, la pression mesurée par le corps d'épreuve 96 est transmise aux moyens de traitement qui sont alimentés de façon autonome par les moyens de stockage d'énergie. Les données sont ensuite transmises depuis les moyens de traitement vers l'extérieur de l'organe. L'organe de mesure 12 est donc autonome, indépendant énergétiquement et capable de transmettre de façon fiable la pression mesurée.Moreover, the measuring device 12 is of the active type. Thus, it is not necessary to calibrate it. Each member 12 can therefore be manufactured at lower cost and quickly. Furthermore, the pressure measured by the test body 96 is transmitted to the processing means which are powered autonomously by the energy storage means. The data is then transmitted from the processing means to the outside of the organ. The measuring member 12 is therefore autonomous, energy independent and capable of reliably transmitting the measured pressure.

En outre, l'organe 12 comprend des moyens 108 de communication par radiofréquences de données acquises par l'organe 12, notamment de la grandeur mesurée par le corps d'épreuve 96 et traitée par les moyens de traitement 99. L'organe 12 comprend des moyens 110 de transmission de la pression entre la surface de mesure de pression 106 du diaphragme 104 et la surface déformable 98 du corps d'épreuve 96. L'organe 12 comprend des moyens 112 de remplissage du boîtier 100 ainsi que des moyens 114 d'obturation des moyens de remplissage 112.In addition, the device 12 comprises means 108 for communication by radiofrequency of data acquired by the device 12, in particular of the quantity measured by the test body 96 and processed by the processing means 99. The device 12 comprises means 110 for transmitting the pressure between the pressure measurement surface 106 of the diaphragm 104 and the deformable surface 98 of the test body 96. The member 12 comprises means 112 for filling the housing 100 as well as means 114 for closure of the filling means 112.

De préférence, le corps d'épreuve 96 comprend un élément du type à jauge de contrainte apte à transformer la déformation subie par la surface déformable 98 en un signal électrique à destination des moyens de traitement 99. En variante, le corps d'épreuve 96 comprend un élément de type piézo-électrique.Preferably, the test body 96 comprises an element of the strain gauge type capable of transforming the deformation undergone by the deformable surface 98 into an electrical signal intended for the processing means 99. Alternatively, the test body 96 includes a piezoelectric type element.

La surface 106 est liée fonctionnellement au corps d'épreuve 96, en l'espèce à la surface 98, de sorte que lorsqu'une pression est exercée sur la surface 106, cette pression est transmise au corps d'épreuve 96, en l'espèce à la surface 98.The surface 106 is functionally linked to the test body 96, in this case to the surface 98, so that when pressure is exerted on the surface 106, this pressure is transmitted to the test body 96, in the species on the surface 98.

Ainsi, l'organe 12 permet de mesurer la pression interne du pneumatique grâce à la surface de mesure de pression 106 qui, en étant fonctionnellement liée au corps d'épreuve 96, transmet la pression jusqu'au corps d'épreuve 96 sans que celui-ci ne soit exposé aux éléments extérieurs au boîtier 14. En effet, la paroi 104 du boîtier est déformable de sorte que la pression reçue par cette paroi 104 à l'extérieur du boîtier est mesurable par le corps d'épreuve 96. Un tel organe 12 est destiné à être agencé dans l'espace délimité par le pneumatique et la jante. Il pourra être indifféremment fixé sur la jante ou sur le pneumatique.Thus, the member 12 makes it possible to measure the internal pressure of the tire thanks to the pressure measurement surface 106 which, by being functionally linked to the test body 96, transmits the pressure to the test body 96 without that -ci is exposed to elements outside the housing 14. Indeed, the wall 104 of the housing is deformable so that the pressure received by this wall 104 outside the housing is measurable by the test body 96. Such a member 12 is intended to be arranged in the space delimited by the tire and the rim. It can either be attached to the rim or to the tire.

A cet effet, les moyens de transmission 110 sont destinés à transmettre la pression exercée sur la surface de mesure de pression 106 à la surface déformable 98.For this purpose, the transmission means 110 are intended to transmit the pressure exerted on the pressure measurement surface 106 to the deformable surface 98.

Le diaphragme 104 présente une forme générale sphéroïde aplatie à son sommet. Le diaphragme 104 comporte des portions circulaires concentriques 118 séparées entre elles par des rainures circulaires 120 concentriques. Les rainures 120 sont équidistantes les unes des autres deux à deux. Comme illustré sur les figures 4 et 10 la paroi 104 du boîtier étanche 100 présente, en coupe, au moins une portion présentant un profil sensiblement sinusoïdal.The diaphragm 104 has a general spheroid shape flattened at its top. The diaphragm 104 comprises concentric circular portions 118 separated from one another by circular grooves 120 concentric. The grooves 120 are equidistant from each other in pairs. As illustrated on the figure 4 And 10 the wall 104 of the sealed case 100 has, in section, at least one portion having a substantially sinusoidal profile.

Le diaphragme 104 est réalisé en acier inoxydable et la surface 106 est revêtue d'une pellicule métallique inerte, par exemple l'or, le palladium ou le platine.The diaphragm 104 is made of stainless steel and the surface 106 is coated with an inert metallic film, for example gold, palladium or platinum.

Cette couche permet d'éviter la corrosion du diaphragme 104 et de préserver ses caractéristiques mécaniques.This layer makes it possible to prevent corrosion of the diaphragm 104 and to preserve its mechanical characteristics.

Le support 102 forme une paroi du boîtier 100 et est réalisé en céramique. Le support 102 étant réalisé en céramique, il est parfaitement étanche et inerte vis-à-vis des agressions chimiques, notamment de celles provenant des produits utilisés pour l'entretien des jantes et pneumatiques, notamment dans le domaine du génie civil. En outre, des fissures sont susceptibles d'apparaître suite aux dilatations du matériau du support 102 consécutives aux variations de température dans le pneumatique. La céramique présentant une dilatation très faible, l'apparition et l'expansion de fissures dans le support 102 est minimisée.Support 102 forms a wall of housing 100 and is made of ceramic. The support 102 being made of ceramic, it is perfectly sealed and inert vis-à-vis chemical attacks, in particular those originating from products used for the maintenance of rims and tires, in particular in the field of civil engineering. In addition, cracks are liable to appear following the expansion of the material of the support 102 following the temperature variations in the tire. Since the ceramic exhibits very low expansion, the appearance and expansion of cracks in the support 102 is minimized.

L'organe 12 comprend un circuit électronique 122 de pistes en cuivre gravées dans le support 102. Le support 102 porte les moyens de traitement 99 qui sont reliés au corps d'épreuve 96, aux moyens de transmission 108 et aux moyens de stockage d'énergie 101 par l'intermédiaire du circuit 122.The device 12 comprises an electronic circuit 122 of copper tracks etched in the support 102. The support 102 carries the processing means 99 which are connected to the test body 96, to the transmission means 108 and to the data storage means. energy 101 via circuit 122.

Les moyens de communication 108 comprennent une antenne 124 de type hélicoïdale. Ce type d'antenne permet d'obtenir un rayonnement relativement efficace dans un volume réduit. L'antenne 124 est située à l'extérieur de l'espace interne E. L'antenne 124 étant située à l'extérieur de l'espace interne E, ses propriétés de rayonnement sont préservées et ne sont pas altérées par le boîtier 14 de mesure de pression ou le matériau 136.The communication means 108 comprise an antenna 124 of the helical type. This type of antenna makes it possible to obtain relatively effective radiation in a small volume. The antenna 124 is located outside the internal space E. The antenna 124 being located outside the internal space E, its radiation properties are preserved and are not altered by the housing 14 of pressure measurement or material 136.

L'organe 12 comprend également un boîtier 126 de protection de l'antenne 124 dans lequel cette dernière est encapsulée. Le boîtier 126 est rapporté sur le boîtier 100, ici le support 102, et est réalisé dans un matériau présentant une constante diélectrique comprise entre 1 et 5, par exemple en polyuréthane thermodurcissable. Un tel matériau permet de protéger l'antenne des agressions chimiques, notamment de celles provenant des produits utilisés pour l'entretien des jantes et pneumatiques, notamment dans le domaine du génie civil, et susceptibles d'être présents à l'intérieur du pneumatique.The member 12 also comprises a housing 126 for protecting the antenna 124 in which the latter is encapsulated. The box 126 is attached to the box 100, here the support 102, and is made of a material having a dielectric constant between 1 and 5, for example thermosetting polyurethane. Such a material makes it possible to protect the antenna from chemical attacks, in particular from those originating from products used for the maintenance of rims and tires, in particular in the field of civil engineering, and likely to be present inside the tire.

Les moyens de remplissage 112 comprennent un orifice 128 de remplissage du boîtier 100 ménagé dans le support 102. L'orifice 128 est obturé par les moyens d'obturation 114, en l'espèce par un organe 130 d'obturation vissé en force dans un filetage 132 porté par le support 102. L'organe 130 comporte un orifice 134 de maintien de l'antenne 124 et est réalisée dans un matériau conducteur électriquement afin de transmettre les signaux électriques depuis l'intérieur du boîtier 14 vers l'extérieur du boîtier 14. L'organe 130 est réalisé dans un matériau permettant la soudure de l'antenne 124 dans l'orifice 134. L'organe 130 est donc relié électriquement et mécaniquement à l'antenne 124. Le remplissage du boîtier 100 s'effectue par un produit en phase liquide, sous vide, à une température comprise entre 50°C et 80°C afin d'assurer une parfaite pénétration du produit dans la totalité de l'espace E, y compris les espaces situés entre les composants électroniques du circuit 122.The filling means 112 comprise an orifice 128 for filling the housing 100 formed in the support 102. The orifice 128 is closed off by the closing means 114, in this case by a closing member 130 force-screwed into a thread 132 carried by the support 102. The member 130 comprises an orifice 134 for holding the antenna 124 and is made of an electrically conductive material in order to transmit electrical signals from the inside of the housing 14 to the outside of the housing 14. The member 130 is made of a material allowing the welding of the antenna 124 in the orifice 134. The member 130 is therefore electrically connected and mechanically to the antenna 124. The filling of the housing 100 is carried out with a product in the liquid phase, under vacuum, at a temperature between 50° C. and 80° C. in order to ensure perfect penetration of the product into the entire space E, including the spaces between the electronic components of circuit 122.

En variante, on remplit le boîtier 100 par un produit à une première température comprise entre 50°C et 80°C. Ce produit est réticulable. A cette température et durant cette étape de remplissage, le produit est dans une phase liquide. Le produit peut être mono-composant, bi-composants ou multi-composants. Ensuite, on laisse le produit réticuler à une deuxième température. Le produit forme alors un matériau dans une phase gel. En variante, on laisse le produit réticuler à la première température.Alternatively, the box 100 is filled with a product at a first temperature of between 50°C and 80°C. This product is crosslinkable. At this temperature and during this filling step, the product is in a liquid phase. The product can be mono-component, bi-component or multi-component. Then, the product is left to cure at a second temperature. The product then forms a material in a gel phase. Alternatively, the product is left to cure at the first temperature.

En fonctionnement, les moyens de transmission 110 comprennent un matériau sensiblement incompressible 136 occupant la totalité de l'espace interne E.In operation, the transmission means 110 comprise a substantially incompressible material 136 occupying the entire internal space E.

En occupant la totalité de l'espace interne E, on exclut la présence d'air ou d'un autre matériau, par exemple compressible, qui pourrait perturber la pression détectée par le corps d'épreuve 96, notamment lors de variation de températures. Ainsi, peu importe la pression du pneumatique, l'organe 12 permet de mesurer des pressions pouvant aller jusqu'à 16 bars, voire 30 bars si nécessaire.By occupying all of the internal space E, the presence of air or of another material, for example compressible, which could disturb the pressure detected by the test body 96, in particular during temperature variations, is excluded. Thus, regardless of the pressure of the tire, the member 12 makes it possible to measure pressures that can range up to 16 bars, or even 30 bars if necessary.

On notera que l'incompressibilité du matériau 136 est définie à température constante. Ainsi, un matériau incompressible peut présenter un volume variable en fonction de la température. Ainsi, la déformabilité de la paroi de mesure de pression 106 permet d'adapter la mesure de pression aux variations de température. En effet, lorsque la température augmente ou diminue, le matériau 136 a tendance respectivement à s'étendre ou à se rétracter. La déformabilité du diaphragme 104 lui permet de suivre les variations de volume du matériau en fonction de la température sans altérer la mesure de pression.It will be noted that the incompressibility of the material 136 is defined at constant temperature. Thus, an incompressible material can have a variable volume depending on the temperature. Thus, the deformability of the pressure measurement wall 106 makes it possible to adapt the pressure measurement to temperature variations. Indeed, when the temperature increases or decreases, the material 136 tends respectively to extend or to retract. The deformability of the diaphragm 104 enables it to follow the variations in volume of the material as a function of the temperature without altering the pressure measurement.

Le matériau incompressible de l'organe 12 permet d'éviter l'implosion du boîtier de mesure de pression 14 par rapport à un organe comprenant boîtier ne comprenant que de l'air qui imploserait sous l'effet de la différence de pression entre l'extérieur et l'intérieur du boîtier. En l'espèce, le matériau incompressible 136 est dans une phase liquide et/ou gel dans une plage de températures comprise entre -20°C et +150°C. Ainsi, le matériau 136 demeure dans une phase liquide et/ou gel dans la gamme de températures de fonctionnement de l'organe 12 et conserve, dans cette plage, ses propriétés de transmission directe de la pression depuis la surface de mesure de pression 106 jusqu'au corps d'épreuve 96. Un gel présente un comportement intermédiaire entre un liquide et un solide.The incompressible material of the member 12 makes it possible to prevent the implosion of the pressure measurement box 14 with respect to a member comprising a box comprising only air which would implode under the effect of the pressure difference between the exterior and interior of the case. In this case, the incompressible material 136 is in a liquid and/or gel phase in a temperature range between -20°C and +150°C. Thus, the material 136 remains in a liquid and/or gel phase in the range of operating temperatures of the member 12 and retains, in this range, its properties of direct pressure transmission from the pressure measurement surface 106 to 'At test body 96. A gel presents an intermediate behavior between a liquid and a solid.

Le matériau 136 est diélectrique de sorte qu'il n'interfère pas électriquement avec les signaux électriques du circuit 122, notamment le corps d'épreuve 96 ou le détecteur 99. Dans le cas d'un liquide, le matériau est choisi parmi les huiles à base d'esters ou de glycérine. Dans le cas d'un gel, le matériau utilisé est connu sous la référence TSE 3062 fabriqué par la société MOMENTIVE.The material 136 is dielectric so that it does not interfere electrically with the electrical signals of the circuit 122, in particular the test body 96 or the detector 99. In the case of a liquid, the material is chosen from oils based on esters or glycerin. In the case of a gel, the material used is known under the reference TSE 3062 manufactured by the company MOMENTIVE.

Les moyens 64 comprennent une languette 140 de positionnement de l'organe 12. Cette languette 140 est complémentaire de l'encoche 72 du support 24.The means 64 comprise a tongue 140 for positioning the member 12. This tongue 140 is complementary to the notch 72 of the support 24.

En référence à la figure 4, la paroi de protection 48 est en regard de la surface 106. Le support 24 et le boîtier 14 sont agencés de sorte que la surface de mesure de pression 106 soit positionnée à distance de la paroi 48 du boîtier. Aucune paroi du boîtier n'est au contact de la surface 106 de mesure de pression. Le boîtier 14 permet ainsi de s'assurer qu'aucune autre force que celle liée à la pression de l'air du pneumatique ne s'exercera sur la surface 106 de mesure de pression.With reference to the figure 4 , the protective wall 48 faces the surface 106. The support 24 and the housing 14 are arranged so that the pressure measurement surface 106 is positioned at a distance from the wall 48 of the housing. No wall of the housing is in contact with the surface 106 of pressure measurement. The box 14 thus makes it possible to ensure that no force other than that linked to the air pressure of the tire will be exerted on the pressure measurement surface 106 .

En l'espèce, la hauteur du support 24, ici celle des parois radiales 70b, est supérieure à la hauteur du diaphragme 104. En position assemblée du dispositif 10, les axes Z, Z' et Z" sont sensiblement confondus. Les nervures 56 assurent également une fonction de butée du déplacement axial du support 24. En effet, les pieds 62 étant souples, ceux-ci peuvent se plier. Afin d'éviter que la surface de mesure de pression 106 ne touche la paroi 48, les nervures 56 limitent le déplacement axial du support 24 et donc du boîtier 100.In this case, the height of the support 24, here that of the radial walls 70b, is greater than the height of the diaphragm 104. In the assembled position of the device 10, the axes Z, Z' and Z" are substantially coincident. The ribs 56 also provide a stop function for the axial displacement of the support 24. In fact, the feet 62 being flexible, they can bend.To prevent the pressure measurement surface 106 from touching the wall 48, the ribs 56 limit the axial displacement of the support 24 and therefore of the housing 100.

Grâce au fait que la surface de mesure de pression 106 s'étendent à distance du corps d'épreuve 96, c'est-à-dire n'étant pas directement en contact avec le corps d'épreuve 96, le corps d'épreuve 96 ne peut être usé, ni désolidarisé de son support 102 sous l'effet des efforts répétés sur la surface de mesure de pression 106.Thanks to the fact that the pressure measurement surface 106 extends at a distance from the test body 96, that is to say not being directly in contact with the test body 96, the test body 96 cannot be worn or separated from its support 102 under the effect of repeated efforts on the pressure measurement surface 106.

En effet, le matériau sensiblement incompressible 136 permet à la fois de protéger le corps d'épreuve 96 et à la fois de transmettre directement la pression depuis la surface de mesure de pression 106 jusque vers le corps d'épreuve 96 sans que ceux-ci ne soient en contact direct. La transmission de la pression est réalisée de façon directe, c'est-à-dire que la pression s'appliquant sur la surface de mesure de pression 106 est la pression mesurée par le corps d'épreuve 96. Aucun décalage de la mesure ou off-set n'est introduit par le matériau 136, ce qui permet notamment de s'affranchir d'un étalonnage de l'organe 12.Indeed, the substantially incompressible material 136 makes it possible both to protect the test body 96 and both to directly transmit the pressure from the pressure measurement surface 106 to the test body 96 without these not be in direct contact. The transmission of the pressure is carried out directly, that is to say that the pressure applied to the pressure measurement surface 106 is the pressure measured by the test body 96. No offset in the measurement or off-set is introduced by the material 136, which makes it possible in particular to dispense with a calibration of the member 12.

On a représenté sur la figure 13 un dispositif comprenant un boîtier 14 de protection selon un deuxième mode de réalisation de l'invention. Les éléments analogues à ceux représentés sur les figures précédentes sont désignés par des références identiques.We represented on the figure 13 a device comprising a protective casing 14 according to a second embodiment of the invention. Elements similar to those shown in the preceding figures are designated by identical references.

Dans ce deuxième mode de réalisation, les moyens de solidarisation 16 comprennent un patch 142 portant une glissière de section trapézoïdale mâle 144 sur sa face 90. Les moyens 16 comprennent également une glissière de section trapézoïdale femelle 146 ménagée dans la deuxième partie 22. Le dispositif 10 selon le deuxième mode de réalisation comprend également des moyens 148 de verrouillage du boîtier 14 avec le patch 142. Les moyens de verrouillage 148 comprennent un orifice oblong 150 ménagé dans une oreille 152 portée par une des parois de la partie 22. Les moyens 148 comprennent également une paire 154 de crochets élastiques destinés à être insérés dans l'orifice 150 lorsque l'orifice 150 dépasse une paroi 156 de verrouillage de la glissière mâle 144.In this second embodiment, the securing means 16 comprise a patch 142 bearing a male trapezoidal section slide 144 on its face 90. The means 16 also comprise a female trapezoidal section slide 146 provided in the second part 22. The device 10 according to the second embodiment also comprises means 148 for locking the housing 14 with the patch 142. The locking means 148 comprise an oblong orifice 150 made in an ear 152 carried by one of the walls of the part 22. The means 148 also include a pair 154 of elastic hooks intended to be inserted into the orifice 150 when the orifice 150 projects beyond a locking wall 156 of the male slide 144.

L'invention ne se limite pas aux modes de réalisation précédemment décrits.The invention is not limited to the embodiments described above.

On notera que l'on peut exploiter un boîtier de protection d'un organe de mesure de pression d'un pneumatique comprenant :

  • des première et deuxième parties mobiles l'une par rapport à l'autre entre une position d'insertion de l'organe dans le boîtier et une position de maintien de l'organe dans le boîtier, les première et deuxième parties étant agencées de sorte qu'elles permettent une communication d'air entre l'extérieur et l'intérieur du boîtier lorsqu'elles sont dans la position de maintien;
  • des moyens de filtration de l'air entrant dans le boîtier comprenant un espace de passage de l'air entre l'extérieur et l'intérieur du boîtier défini par les première et deuxième parties,
indépendamment du fait que l'organe de mesure de pression comprenne ou non:
  • une surface de mesure de pression liée fonctionnellement à un corps d'épreuve,
  • un boîtier étanche de mesure de pression dans lequel est agencé le corps d'épreuve, la surface de mesure de pression étant portée par une paroi du boîtier étanche de mesure de pression s'étendant à distance du corps d'épreuve, le boîtier étanche de mesure de pression délimitant un espace interne au boîtier;
  • des moyens de transmission de la pression entre la surface de mesure de pression et le corps d'épreuve comprenant un matériau sensiblement incompressible occupant la totalité de l'espace interne;
  • des moyens de stockage d'énergie et des moyens de traitement de la pression détectée par le corps d'épreuve agencés dans le boîtier étanche.
It will be noted that it is possible to use a protective casing for a tire pressure measuring device comprising:
  • first and second parts movable relative to each other between a position for inserting the member into the housing and a position for maintaining the member in the housing, the first and second parts being arranged so that they allow air communication between the outside and the inside of the casing when they are in the holding position;
  • means for filtering the air entering the casing comprising an air passage space between the exterior and the interior of the casing defined by the first and second parts,
regardless of whether or not the pressure measuring device includes:
  • a pressure measurement surface functionally linked to a test body,
  • a sealed pressure measurement box in which the test body is arranged, the pressure measurement surface being carried by a wall of the sealed pressure measurement box extending at a distance from the test body, the sealed box pressure measurement delimiting a space internal to the casing;
  • means for transmitting the pressure between the pressure measuring surface and the test body comprising a substantially incompressible material occupying the entire internal space;
  • energy storage means and means for processing the pressure detected by the test body arranged in the sealed casing.

Claims (5)

Boîtier (14) de protection d'un organe (12) de mesure de pression d'un pneumatique, caractérisé en ce qu'il comprend: - des première et deuxième parties (20, 22) mobiles l'une par rapport à l'autre entre une position d'insertion de l'organe (12) dans le boîtier (14) et une position de maintien de l'organe (12) dans le boîtier (14), les première et deuxième parties (20,22) étant agencées de sorte qu'elles permettent une communication d'air entre l'extérieur et l'intérieur du boîtier (14) lorsqu'elles sont dans la position de maintien; - des moyens (31) de filtration de l'air entrant dans le boîtier (14) comprenant un espace (58) de passage de l'air entre l'extérieur et l'intérieur du boîtier (14) défini par les première et deuxième parties (20, 22), dans lequel l'espace (58) de passage de l'air est défini au moins en partie par une jupe de recouvrement (35) d'une paroi latérale (46a-d) d'une des première et deuxième parties (20, 22).Casing (14) for protecting a tire pressure measurement member (12), characterized in that it comprises: - first and second parts (20, 22) movable relative to each other between a position for inserting the member (12) into the housing (14) and a position for maintaining the member ( 12) in the housing (14), the first and second parts (20,22) being arranged so that they allow air communication between the outside and the inside of the housing (14) when they are in the holding position; - means (31) for filtering the air entering the casing (14) comprising a space (58) for the passage of air between the exterior and the interior of the casing (14) defined by the first and second parts (20, 22), wherein the air passage space (58) is defined at least in part by a covering skirt (35) of a side wall (46a-d) of one of the first and second parts (20, 22 ). Boîtier (14) selon la revendication 1, comprenant des moyens d'entretoisement (27) entre les première et deuxième parties (20, 22).Housing (14) according to claim 1, comprising spacer means (27) between the first and second parts (20, 22). Boîtier (14) selon la revendication 1 ou 2, dans lequel l'espace (58) de passage présente, en coupe, un profil général en forme de coude entre l'intérieur et l'extérieur du boîtier (14).Housing (14) according to Claim 1 or 2, in which the passage space (58) has, in section, a general profile in the shape of an elbow between the inside and the outside of the housing (14). Boîtier (14) selon l'une quelconque des revendications 1 à 3, dans lequel la jupe de recouvrement (35) présente un profil effilé.Housing (14) according to any of claims 1 to 3, wherein the cover skirt (35) has a tapered profile. Boîtier (14) selon l'une quelconque des revendications 1 à 4, dans lequel la jupe de recouvrement (35) s'étend sur la totalité de la périphérie de la partie correspondante (20, 22).Housing (14) according to any one of Claims 1 to 4, in which the cover skirt (35) extends over the entire periphery of the corresponding part (20, 22).
EP23171439.5A 2009-09-30 2010-09-30 Sealed pressure-measuring member Pending EP4235130A3 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0956796A FR2950691B1 (en) 2009-09-30 2009-09-30 SEALED PRESSURE MEASURING MEMBER
PCT/FR2010/052071 WO2011039486A2 (en) 2009-09-30 2010-09-30 Sealed pressure-measuring member
EP10778688A EP2483654A2 (en) 2009-09-30 2010-09-30 Sealed pressure-measuring member

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EP4235130A2 true EP4235130A2 (en) 2023-08-30
EP4235130A3 EP4235130A3 (en) 2023-10-18

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JP (1) JP5675823B2 (en)
CN (2) CN102575966B (en)
AU (1) AU2010302457B2 (en)
BR (1) BR112012007171B1 (en)
CA (2) CA2775382C (en)
CL (2) CL2012000770A1 (en)
FR (1) FR2950691B1 (en)
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EP4235130A3 (en) 2023-10-18
CN102575966B (en) 2015-06-17
BR112012007171A2 (en) 2016-03-29
FR2950691B1 (en) 2012-05-04
US9476789B2 (en) 2016-10-25
US20170003188A1 (en) 2017-01-05
CL2015003392A1 (en) 2016-08-12
AU2010302457A8 (en) 2012-05-24
WO2011039486A2 (en) 2011-04-07
RU2567179C2 (en) 2015-11-10
JP2013506827A (en) 2013-02-28
CL2012000770A1 (en) 2012-12-14
AU2010302457B2 (en) 2014-09-25
US20120239313A1 (en) 2012-09-20
FR2950691A1 (en) 2011-04-01
WO2011039486A3 (en) 2011-07-07
CA2775382A1 (en) 2011-04-07
JP5675823B2 (en) 2015-02-25
CA2775382C (en) 2018-05-29
CA2943691A1 (en) 2011-04-07
CN104865007B (en) 2018-01-02
RU2012114817A (en) 2013-11-20
BR112012007171B1 (en) 2020-04-22
EP2483654A2 (en) 2012-08-08
CA2943691C (en) 2018-01-16
ZA201202212B (en) 2013-01-30
AU2010302457A1 (en) 2012-05-17
CN102575966A (en) 2012-07-11
BR112012007171A8 (en) 2018-01-02
CN104865007A (en) 2015-08-26

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